Richard thompson



(No Model.)

R. THOMPSON.

DAM PER REGULATOR.

No. 272,989. Patented Peb.27,18'83.

)fz'inesses.

UNrrED STATES PATENT Garrett.

RICHARD THOMPSON, OF NEW YORK, ASSIGNOR TO GEORGE H. CLARKE,

OE BROOKLYN, N. Y.

DAM PER-REGULATOR;

SPECIFICATION forming part of Letters Patent No. 272,989, dated February 27, 1883.

Application filed December 4,1882. (No model.)

To all whom it may concern:

Be it known that I, RICHARD THoMPsori, of New York, county and State of New York, have invented certain new and useful 1mprovements in Damper-Regulators, of which the followingis a specification.

This invention relates to that class of boilerfurnace draft-regulators-such as is shown in the Letters Patent of the United States No. 59,439, dated November 6, 1866, and No.77,081, dated April 21, 1868, granted to James 1?.Neall and William Meyers-in which are a piston and cylinder having communication with the interior ofthe boiler, so connected to the damper in flue or furnace door as to operate the same to regulate the draft according to the rise and fall of the steam-pressure in' the boiler.

This invention has for its object to make such draft-regulators more perfect in their action; and it consists, first, in applying thereto adjustable stops, whereby the limit of movement of the regulator is governed, and the damper actuated thereby may be set to close the flue as much as is desirable; secondly, in

the application of spiral springs so arranged and made adjustable that their faces may be brought into play to partly oppose the steampressure of the boiler in the regulator at any point of the moving part of the regulator, according to the desired pressure at which it is intended to have the damper act, and to oppose an increasing force to such movement, as will be fully understood by reference had to the accompanying drawings, forming part of this specification, in which- Figure l is at front elevation of my improvements in draft-regulators. Fig. 2 is a vertical section of the same. Fig. 3 is a side elevation, and Fig. 4 is a transverse section cut on the line 00 ac.

The cylinder a, made preferably of brass tubing, is held in a vertical position by means of the end piece, b, into which its lower end is screwed, and the bracket 0, through which its upper end passes, the end piece and bracket 0 being secured to the wall or a board, as shown.

In the cylinder at is fitted the piston 01 by means of a suitable packing, so as to be steam and water tight, and yet move with the least amount of friction. Its piston-rod e passes f freely through the cap a of the cylinder at, and

to the upper end of this rod 0 is secured the cross-headf. Two rods, g and g, fastened in the cross-headf, extend down either side of the cylinder at, being guided by holes in the end piece, b, and bracket 0, and to their lower ends is attached the weight It.

On the rods 9 and 9, between the end piece, b, and bracket 0, are placed the stop-collars t and t", adapted to be adjusted on the rods by means of set-screws, to determine the height to which the piston d can be raised by the pressure in the cylinder at by their coming in contact with the under side of the bracket 0.

The cross-headfis shown connected to the quadrant or lever k of the damperj in the furnace-flue l by means of the chain or cord m, which passes over the guide-pulleys m m.

The connection of the moving piston, or other parts of the apparatus moving therewith, to the damper may be made in any suitable manner, and will depend generally upon the location of the damper of the boiler to which the regulator is applied.

The collar-stops t i provide a ready means for determining the upward movement of the piston to set the damper, so that it shall never be entirely closed and become jammed in the flue, as sometimes happens with other automatic dam per-regulators, it generally being required to have the dam pcrs openedsufficiently to allow the gases to pass up the flue when the draft is intended to be cut off.

Communication between the cylinder at and boiler is had by means of the pipe n, which screws into a hole in end piece, I), connected to theinteriorofthe cylinder by the passage-wayo.

Extra detachable weights (shown by the dotted lines it it its) are placed on the weight It, according to the pressure at which it is desired to have the regulator commence to act; but an increasing resistance to the movement of the piston d is required to insure the proper regulation of the damper-opening, and l have found in practice that this increasing resistance, to give perfect results, should not be applied until the piston has moved some distance,

and also that it is much better to make the same adjustable as to when the extra resistance should be applied, and also as to the progressive increase of the resistance opposed to the boiler-pressure. To accomplish this dethe rods 9 and g, and rest on the adjustable sirable result two spiral springs, pp, surround collars q and q, secured to the rods by setscrews, the springs beingin their normal open condition when the piston is at the bottom of the cylinder and the damper open. The washers 'r r on the tops of the springs are then some inches below the bottom of the end piece, I), as shown at Figs. 1 and 3. When the steam in the boiler approaches the pressure that it is desired to be maintained at, the piston commences to rise, it then being opposed by the weights at the lower ends of the rods gg only, which are adjusted to hold down the piston with a force somewhat less than the force of the maximum pressure of the steam on the under side of the piston. This insures the movement of the piston, should it stick in the cylinder after being at rest, and allows it to move some distance before the springs act, which are adjusted to gradually increase the opposing force until it finally equals that of the desired maximum pressure of the steam, thereby grad ually shutting off the draft at the same time the steam-pressure is obtaining its highest point, thus gradually reducing the intensity of the tire and avoiding any sudden action of the regulator.

I wish it understood that I do not claim, broadly, the application of resisting spring or springs to piston damper regulators, as such is shown in the patent to P. Lamb,No.43,2l3, dated June 21, 1864..

What I claim, and desire to secure by Letters Patent, is

1. The movingpiston ofa damper-regulator, connected to the damper and provided with an opposing weight suspended therefrom by means of rods, in combination with adjustable stops on the rods,wherebytheheight at which .0 the piston is moved is determined to govern the point at which the damper is closed, substantially as set forth.

2. In a damper-regulator, the combination, with the piston provided with a predetermined 4 5 Weight and actuated by the steam-pressure in the boiler to close the damper, of springs adapted to be brought into play to oppose a gradually-increasing force to the moving piston after it has commenced to close the damp- 5o er, substantially as set forth.

3. In combination, the cylinder a, piston d, c the damper of a boiler-flue, l, the cross-headf, rods 9 g, weight h, and springspp, with their. adjustable collars q q, substantially as and 55 for the purpose set forth.

4. In combination, the cylinder a, piston (1. the damper of a boiler-flue, Z, the cross-head f, rods 9 g, weight h, springspp, with their adjustable collars q q, and the adjustable stops 60 it, substantially as and for the purpose set forth.

In witness whereof I have hereunto set my hand, at New York, county and State of New York, this 2d day of December, A. D, 1882.

RICHARD THOMPSON.

Witnesses:

H. D. WILLIAMs, E. G. BAKER. 

